Jessica Simpson flaunted her fit swimsuit body in an Instagram photo she posted during her honeymoon. Simpson looks unbelievable after her 70-pound weight loss on a low-carb, sugar-free diet.

Simpson said she is in the best shape of her life after losing 70 pounds on a low-carb Weight Watchers diet that drastically limited sugar intake.

Simpson, a rep for Weight Watchers, switched to a vegan diet in the two weeks leading up to her July 5 wedding to accelerate weight loss.

Walking, Yoga and Gym Workouts

In addition to following a low-carb, sugar-free diet, Simpson walked six miles every day, did yoga, and worked out at the gym for 45 minutes, four days a week, with her longtime trainer Harley Pasternak. All the hard work paid off, as Jessica looked incredible in her form-fitting sleeveless Carolina Herrera wedding dress.

Pasternak said Jessica's workouts combined 10 to 20 minutes of cardio exercise, 20 to 30 minutes of resistance training, and lots of flexibility moves. Pasternak also trains Halle Berry, Megan Fox (who lost about 25 pounds on the Paleo diet) and Lady Gaga.

Jessica, who has struggled with weight her entire life, admitted her pregnancy weight gain made her depressed and insecure. "I was so insecure; I couldn't even believe what I weighed," she said. "It is a really hard thing to go through."

'I Understand Women's Weight Struggles'

Interestingly, Simpson said she believes her weight problems are part of the reason she's so successful with her clothing line, which boasts annual sales of $1 billion. Simpson said women relate to her because she's not naturally skinny and has weight issues, just like many of them do.

“I have been every size on the planet and I understand women,” she told Forbes. “I definitely go up and down with my weight, and I'm really honest about it. If I'm five pounds heavier, if I'm 50 pounds heavier, or five pounds lighter, I just don’t think it should define who you are."

Jessica said she is glad she never caved in to the extreme pressure to resort to starvation diets or other unhealthy measures. "I was proud of myself throughout that period for not doing every crash diet and trying to get as skinny as I could, or not eating," she said.

Simpson, who's divorced from singer Nick Lachey, began dating former NFL star Eric Johnson in 2010. The couple has two children: daughter, Maxwell, age two, and one-year-old son Ace.

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Samantha Chang is the co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.